"This is a web poll, and cannot replicate all radio listeners or even all Rock radio listeners. As with all Internet-based research studies, the results reflect only those who chose to participate."
They forgot to put this in the article. And also they seem to imply that the classic rock listeners are male, which is not what their study looked at. The article bends the truth even further, saying male fans of led zepplin. Journalists who write this kind of bullshit should go shop for a coffin, and so should the people who publish it.